<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>加加减减</title>
</head>

<body>
  <div id="app">
    <button @click="btnRandom">走一走</button>
    <ul>
      <li v-for="(item, index) in list" :key="index" @click="delBtn(index)">
        <span>{{item.id}}</span>
        <button>{{item.content}}</button>
      </li>
    </ul>
  </div>
  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.7.14/vue.js"></script>
  <script>
    const app = new Vue({
      el: "#app",
      data: {
        list: [],
        randomVal: "",
        id: 0
      },
      methods: {
        btnRandom() {
          this.id++
          this.list.push({ id1: this.id, id: Math.floor(Math.random() * 20), content: "删除" });
        },
        delBtn(index) {

          this.list.splice(index, 1)
        }
      },
      
    });
  </script>
</body>

</html>